rails/rails — pull request #4865 by bogdan (2012-02-03 14:18:05+00:00)
Title: AC::Callbacks: remove usage of :per_key option from filters

This commit removes the only one usage of `:per_key` option as it currently doesn't make sense. See #4493.

So, it's not used by Rails anymore.
Now we can deprecate and just remove it. This will safe additional performance and reduce lines of code.
I would say that we can remove it bypassing deprecation, because:

* I can't believe somebody is using it outside of rails
* There is a clean way how it can be reworked with general `:unless` and `:if` option
* Next release will be major

What do you think guys?